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authorThomas Rast <trast@student.ethz.ch>2013-03-28 17:47:33 +0100
committerJunio C Hamano <gitster@pobox.com>2013-03-28 10:30:04 -0700
commit13b8f68c1f0b6d4ff5a7bed5a834e7e5e34a9fd0 (patch)
tree8e28bd102d82587678bb9ab32345f26039bf0ad4 /line-range.c
parent12da1d1f6ffcd546a892a33302bb34fd37169022 (diff)
downloadgit-13b8f68c1f0b6d4ff5a7bed5a834e7e5e34a9fd0.tar.gz
log -L: :pattern:file syntax to find by funcname
This new syntax finds a funcname matching /pattern/, and then takes from there up to (but not including) the next funcname. So you can say git log -L:main:main.c and it will dig up the main() function and show its line-log, provided there are no other funcnames matching 'main'. Signed-off-by: Thomas Rast <trast@student.ethz.ch> Signed-off-by: Junio C Hamano <gitster@pobox.com>
Diffstat (limited to 'line-range.c')
-rw-r--r--line-range.c136
1 files changed, 135 insertions, 1 deletions
diff --git a/line-range.c b/line-range.c
index 7a7ca3c2bd..8faf943745 100644
--- a/line-range.c
+++ b/line-range.c
@@ -1,5 +1,8 @@
#include "git-compat-util.h"
#include "line-range.h"
+#include "xdiff-interface.h"
+#include "strbuf.h"
+#include "userdiff.h"
/*
* Parse one item in the -L option
@@ -84,9 +87,137 @@ static const char *parse_loc(const char *spec, nth_line_fn_t nth_line,
}
}
+static int match_funcname(xdemitconf_t *xecfg, const char *bol, const char *eol)
+{
+ if (xecfg) {
+ char buf[1];
+ return xecfg->find_func(bol, eol - bol, buf, 1,
+ xecfg->find_func_priv) >= 0;
+ }
+
+ if (bol == eol)
+ return 0;
+ if (isalpha(*bol) || *bol == '_' || *bol == '$')
+ return 1;
+ return 0;
+}
+
+static const char *find_funcname_matching_regexp(xdemitconf_t *xecfg, const char *start,
+ regex_t *regexp)
+{
+ int reg_error;
+ regmatch_t match[1];
+ while (1) {
+ const char *bol, *eol;
+ reg_error = regexec(regexp, start, 1, match, 0);
+ if (reg_error == REG_NOMATCH)
+ return NULL;
+ else if (reg_error) {
+ char errbuf[1024];
+ regerror(reg_error, regexp, errbuf, 1024);
+ die("-L parameter: regexec() failed: %s", errbuf);
+ }
+ /* determine extent of line matched */
+ bol = start+match[0].rm_so;
+ eol = start+match[0].rm_eo;
+ while (bol > start && *bol != '\n')
+ bol--;
+ if (*bol == '\n')
+ bol++;
+ while (*eol && *eol != '\n')
+ eol++;
+ if (*eol == '\n')
+ eol++;
+ /* is it a funcname line? */
+ if (match_funcname(xecfg, (char*) bol, (char*) eol))
+ return bol;
+ start = eol;
+ }
+}
+
+static const char *parse_range_funcname(const char *arg, nth_line_fn_t nth_line_cb,
+ void *cb_data, long lines, long *begin, long *end,
+ const char *path)
+{
+ char *pattern;
+ const char *term;
+ struct userdiff_driver *drv;
+ xdemitconf_t *xecfg = NULL;
+ const char *start;
+ const char *p;
+ int reg_error;
+ regex_t regexp;
+
+ assert(*arg == ':');
+ term = arg+1;
+ while (*term && *term != ':') {
+ if (*term == '\\' && *(term+1))
+ term++;
+ term++;
+ }
+ if (term == arg+1)
+ return NULL;
+ if (!begin) /* skip_range_arg case */
+ return term;
+
+ pattern = xstrndup(arg+1, term-(arg+1));
+
+ start = nth_line_cb(cb_data, 0);
+
+ drv = userdiff_find_by_path(path);
+ if (drv && drv->funcname.pattern) {
+ const struct userdiff_funcname *pe = &drv->funcname;
+ xecfg = xcalloc(1, sizeof(*xecfg));
+ xdiff_set_find_func(xecfg, pe->pattern, pe->cflags);
+ }
+
+ reg_error = regcomp(&regexp, pattern, REG_NEWLINE);
+ if (reg_error) {
+ char errbuf[1024];
+ regerror(reg_error, &regexp, errbuf, 1024);
+ die("-L parameter '%s': %s", pattern, errbuf);
+ }
+
+ p = find_funcname_matching_regexp(xecfg, (char*) start, &regexp);
+ if (!p)
+ die("-L parameter '%s': no match", pattern);
+ *begin = 0;
+ while (p > nth_line_cb(cb_data, *begin))
+ (*begin)++;
+
+ if (*begin >= lines)
+ die("-L parameter '%s' matches at EOF", pattern);
+
+ *end = *begin+1;
+ while (*end < lines) {
+ const char *bol = nth_line_cb(cb_data, *end);
+ const char *eol = nth_line_cb(cb_data, *end+1);
+ if (match_funcname(xecfg, bol, eol))
+ break;
+ (*end)++;
+ }
+
+ regfree(&regexp);
+ free(xecfg);
+ free(pattern);
+
+ /* compensate for 1-based numbering */
+ (*begin)++;
+
+ return term;
+}
+
int parse_range_arg(const char *arg, nth_line_fn_t nth_line_cb,
- void *cb_data, long lines, long *begin, long *end)
+ void *cb_data, long lines, long *begin, long *end,
+ const char *path)
{
+ if (*arg == ':') {
+ arg = parse_range_funcname(arg, nth_line_cb, cb_data, lines, begin, end, path);
+ if (!arg || *arg)
+ return -1;
+ return 0;
+ }
+
arg = parse_loc(arg, nth_line_cb, cb_data, lines, 1, begin);
if (*arg == ',')
@@ -100,6 +231,9 @@ int parse_range_arg(const char *arg, nth_line_fn_t nth_line_cb,
const char *skip_range_arg(const char *arg)
{
+ if (*arg == ':')
+ return parse_range_funcname(arg, NULL, NULL, 0, NULL, NULL, NULL);
+
arg = parse_loc(arg, NULL, NULL, 0, -1, NULL);
if (*arg == ',')